▎ 摘　　要

Graphene oxide (GO) is a derivative of graphene which has been widely explored for various applications, especially when functionalized with metals or semiconductors. In the current study, first-principles density functional theory was used to explore the electronic, magnetic, and optical properties of graphene oxide nanosheets doped with Au atoms. An initial increase in the induced magnetic moment was observed at low dopant concentration (1Au -> 2 mu B), but the Au:GO composite becomes nonmagnetic with increased dopant concentration (4Au -> 0 mu B). The electron density difference analysis indicates a depletion of electrons from carbon atoms while an analysis of density of states shows strong hybridization between the Au-5p, 5d, O-2p, and C-2p orbitals, which explains the observed magnetism. Further, damping of the absorption spectra was observed with a shift in pi -> pi* and pi + sigma transitions at high Au doping concentration. The optical damping and decrease in magnetic properties of GO at high Au doping levels can be harvested for demagnetization and magnetic shielding applications.